Smog cloaks balloons

Getty Images

Balloons are seen through forest fire smog over the Red Square in Moscow on August 8, 2010. Smog from wildfires in the countryside cloaked Moscow, with the levels of toxic particles, raising alarm over public health and numerous commuters wearing anti-pollution masks.

Balloons are seen through forest fire smog over the Red Square in Moscow on August 8, 2010. Smog from wildfires in the countryside cloaked Moscow, with the levels of toxic particles, raising alarm over public health and numerous commuters wearing anti-pollution masks. (Getty Images)

Balloons are seen through forest fire smog over the Red Square in Moscow on August 8, 2010. Smog from wildfires in the countryside cloaked Moscow, with the levels of toxic particles, raising alarm over public health and numerous commuters wearing anti-pollution masks.